Photos 5.0 cannot duplicate certain photos
While many are trying to find a way to erase duplicate photos, my Macbook Pro has lost the ability to duplicate "certain" photos on demand. I have tried Command+D, I have tried the menu, but no good. While some photos are duplicated, other cannot be. I have tired to find a common characteristics between the ones that cannot be duplicated; does not matter if edited, or has face name, or location, or from a certain camera, the issue seems random, since photos with similar metadata can either be duplicated or not.
Thank you in advance:
MBP 2020 on Catalina, Photos 5.0
MacBook Pro 13″, macOS 10.15